diff --git a/exercises/calculator.cpp b/exercises/calculator.cpp
index 013cc786..78b6d959 100644
--- a/exercises/calculator.cpp
+++ b/exercises/calculator.cpp
@@ -10,3 +10,45 @@
   Multiplication: 8
   Division: 2
 */
+
+
+#include <iostream>
+#include <cstdlib> // per EXIT_FAILURE
+using namespace std;
+
+int main() {
+    double num1, num2;
+
+    // Input del primo numero
+    cout << "Insert first number: ";
+    if (!(cin >> num1)) {
+        cerr << "Invalid input." << endl;
+        return EXIT_FAILURE;
+    }
+
+    // Input del secondo numero, controllo divisione per zero
+    while (true) {
+        cout << "Inserisci secondo numero: ";
+        if (!(cin >> num2)) {
+            cerr << "ERRORE" << endl;
+            return EXIT_FAILURE;
+        }
+        if (num2 != 0) break; // numero valido
+        cout << "Inserisci un'altro numero" << endl;
+    }
+
+    // Operazioni
+    double sum = num1 + num2;
+    double difference = num1 - num2;
+    double multiplication = num1 * num2;
+    double division = num1 / num2;
+
+    // Output
+    cout << "SUM: " << sum << endl;
+    cout << "Difference: " << difference << endl;
+    cout << "Multiplication: " << multiplication << endl;
+    cout << "Division: " << division << endl;
+
+    return EXIT_SUCCESS;
+}
+